87 GN needing some help

[stevestatix]

Hello to all. First time posting on here so I will make sure I give as much information as possible.

Steve Sadek U.S. Marine (active) stationed at Quantico. Found this GN at Fredericksburg Auto Sales for $11K. Body looked great and overall was in good condition for her age. Didnt do my homework on venders and part reviews like I should have but cannot change that now. Here is a partial list;

1987 Grand National
98,500 miles
T-Tops
Stock Block
Stock Tranny
Stock Suspension
Hardened Stator
A bigger raditator that dosnt fit well
Cold air intake from GN1 Performance
3" SS Exhaust from GN1 Performance
Custom 66 Turbo and External wasgate down pipe from GN1 Performance
Turbonetics Boost Controller from GN1 Performance
Thumb Wheel with chip from ???
A/C delete with CRH Bracket
42lb Injectors
Hotwired fuel pump
Stock Intercooler
160deg Thermostat
LS1 Maf with Translator
There are a couple more things that were done but I do not have the email from the old owner anymore.

I replaced the stock turbo with the GN1 combo deal (wish I didnt but I did). Replaced valley pan and gasket, intake pleneum gasket, water pump gasket, downpipe gasket, turbo to header gasket, new intercooler hoses, t-bolt clamps, new fuel injector seals, new fuel rail seals, intake and exhaust. I put everything on myself.

She is smoking from the exhaust like a chimney, thick and white smoke. Smells real rich aswell. Once warmed up the smoke is less but still there. Had a few problems with boost controller and overbosted twice wich made my throttle body hose blow off and ruin a perfectly good hood liner. The check engine light comes on when i let off the throttle but goes away when on it. An older gentlemen mentioned to me that the head bolts are aftermarket so the heads were removed at one point. I didnt want to take the motor "apart" again but I am leaning to that route. Any help or ideas would be greatful as I was quoted $95 an hour for diagnosing fee. Thank you for your help and knowledge.